feat(stdlib): jsonField extern for minimal JSON field extraction #103

Job	Run time
governance / Security policy checks	6s
governance / Language / package anti-pattern policy	5s
governance / Workflow security linter	6s
governance / Well-Known (RFC 9116 + RSR)	6s
governance / Code quality + docs	13s
governance / Guix primary / Nix fallback policy	6s
	42s

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